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  <title>Determine if a file descriptor is an interactive terminal</title>

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</div><hr /><div id="function.posix-isatty" class="refentry">
 <div class="refnamediv">
  <h1 class="refname">posix_isatty</h1>
  <p class="verinfo">(PHP 4, PHP 5)</p><p class="refpurpose"><span class="refname">posix_isatty</span> &mdash; <span class="dc-title">Determine if a file descriptor is an interactive terminal</span></p>

 </div>
 
 <div class="refsect1 description" id="refsect1-function.posix-isatty-description">
  <h3 class="title">说明</h3>
  <div class="methodsynopsis dc-description">
   <span class="type">bool</span> <span class="methodname"><strong>posix_isatty</strong></span>
    ( <span class="methodparam"><span class="type">int</span> <code class="parameter">$fd</code></span>
   )</div>

   <p class="para rdfs-comment">
    Determines if the file descriptor <em><code class="parameter">fd</code></em> refers to a valid
    terminal type device.
  </p>
 </div>

    
 <div class="refsect1 parameters" id="refsect1-function.posix-isatty-parameters">
  <h3 class="title">参数</h3>
  <p class="para">
   <dl>

    
     <dt>
<em><code class="parameter">fd</code></em></dt>

     <dd>

      <p class="para">
       The file descriptor.
      </p>
     </dd>

    
   </dl>

  </p>
 </div>

       
 <div class="refsect1 returnvalues" id="refsect1-function.posix-isatty-returnvalues">
  <h3 class="title">返回值</h3>
  <p class="para">
   Returns <strong><code>TRUE</code></strong> if <em><code class="parameter">fd</code></em> is an open descriptor connected
   to a terminal and <strong><code>FALSE</code></strong> otherwise.
  </p>
 </div>

       
 <div class="refsect1 seealso" id="refsect1-function.posix-isatty-seealso">
  <h3 class="title">参见</h3>
  <p class="para">
   <ul class="simplelist">
    <li class="member"><span class="function"><a href="function.posix-ttyname.html" class="function" rel="rdfs-seeAlso">posix_ttyname()</a> - Determine terminal device name</span></li>
   </ul>
  </p>
 </div>

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